const path = require('path');
const HTMLPlugin = require('html-webpack-plugin')
const webpack = require('webpack')
const ExtractPlugin = require('extract-text-webpack-plugin')

const isDev = process.env.NODE_ENV === 'development'

const config = {
  target: 'web',
  entry: path.join(__dirname, './client/index.js'),
  output: {
    filename: "bundle.[hash:8].js",
    path: path.join(__dirname, './dist')
  },
  module: {
    rules: [
      {
        test: /\.vue$/,
        loader: 'vue-loader'
      },
      {
        test: /\.jsx$/,
        loader: 'babel-loader'
      },
      // {
      //   test: /\.css$/,
      //   use: [
      //     'style-loader',
      //     'css-loader',
      //   ]
      // },
      {
        test: /\.(gif|jpg|jpeg|png|svg)$/,
        use: [
          {
            loader: "url-loader",
            options: {
              limit: 1024,
              name: '[name].[ext]'
            }
          }
        ]
      },

    ]
  },
  plugins: [
    new webpack.DefinePlugin({
      'process.env': {
        NODE_ENV: isDev ? '"development"' : '"production"'
      }
    }),
    new HTMLPlugin()
  ]
}

if (isDev) {
  config.module.rules.push({
    test: /\.styl/,
    use: [
      'style-loader',
      'css-loader',
      {
        loader: "postcss-loader",
        options: {
          sourceMap: true,
        }
      },
      'stylus-loader'
    ]
  });
  config.devtool = '#cheap-module-eval-source-map'
  config.devServer = {
    port: 8000,
    host: '0.0.0.0',
    overlay: {
      error: true,
    },
    hot: true,
  }
  config.plugins.push(
    new webpack.HotModuleReplacementPlugin(),
    new webpack.NoEmitOnErrorsPlugin()
  )
} else {
  config.entry = {
    app: path.join(__dirname, './client/index.js'),
    vendor: ['vue']
  }
  config.output.filename = '[name].[chunkhash:8].js'
  config.module.rules.push({
      test: /\.styl/,
      use: ExtractPlugin.extract({
        fallback: 'style-loader',
        use: [
          'css-loader',
          {
            loader: "postcss-loader",
            options: {
              sourceMap: true,
            }
          },
          'stylus-loader'
        ]
      })
    }
  )
  config.plugins.push(
    new ExtractPlugin('styles.[md5:contenthash:hex:8].css'),

  ),
  config.optimization = {
    splitChunks:{
      cacheGroups: {
        commons: {
          name: "vendor",
        },
      },
    },
    runtimeChunk: true
  }
}

module.exports = config
